
class CommonMap{
  static CommonMap _instance;

  static CommonMap get instance => _getInstance();

  factory CommonMap() => _getInstance();

  CommonMap._internal(){
  }

  static CommonMap _getInstance() {
    if(_instance == null){
      _instance = new CommonMap._internal();
    }
    return _instance;
  }

  Map<String,String> map = new Map();

  void put(String key,String value){
    map[key] = value;
  }

  String get(String key){
    return map[key];
  }

}